Word to that, if they could do that right, that would be really REALLY fun. Maybe change the control scheme to a third person horror type deal. I like the idea of having to build up your safe place with a bunch of your friends. Is the zombie fort mod good, McNinja?

Might want to check out Zombie Master though, it's pretty much one play as the AI director and the other players are survivors, and since it has HL2:DM's physics system you can make barricades. The maps and zombie AI are the best I've seen in any source mod with zombies.